+
+# Provide <attr/xattr.h>, if necessary
+
+AC_DEFUN([TAR_HEADERS_ATTR_XATTR_H],
+[
+ AC_ARG_WITH([xattrs],
+ AS_HELP_STRING([--without-xattrs], [don't use linux extended attributes]),
+ [], [with_xattrs=maybe]
+ )
+
+ # First check for <sys/xattr.h>
+ AC_CHECK_HEADERS([sys/xattr.h])
+ AM_CONDITIONAL([TAR_COND_XATTR_H],[test "$ac_cv_header_sys_xattr_h" = yes])
+ if test "$ac_cv_header_sys_xattr_h" != yes; then
+ AC_CHECK_HEADERS([attr/xattr.h])
+ AM_CONDITIONAL([TAR_COND_XATTR_H],[test "$ac_cv_header_attr_xattr_h" = yes])
+ fi
+
+ if test "$with_xattrs" != no; then
+ for i in getxattr fgetxattr lgetxattr \
+ setxattr fsetxattr lsetxattr \
+ listxattr flistxattr llistxattr
+ do
+ AC_SEARCH_LIBS($i, attr)
+ eval found=\$ac_cv_search_$i
+ test "$found" = "no" && break
+ done
+
+ if test "$found" != no; then
+ AC_DEFINE([HAVE_XATTRS],,[Define when we have working linux xattrs.])
+ fi
+ fi
+])